When rotating the camshaft with the timing chain removed, rotate the crankshaft damper counterclockwise 40°from the TDC and align its timing notch with the matchmark of the timing chain cover to prevent the pistons from coming into contact with the valves.

Fig. Step 13: Hold the chain by hand, and remove the camshaft and the camshaft timing gear assembly

Fig. Step 14: Tie the chain with a piece of string as shown

Remove the camshaft timing gear assembly:

Clamp the camshaft in a vise and confirm that it is locked.

NOTE

One of the 2 grooves located on the cam journal is for retarding cam timing (upper) and the other is for advancing cam timing (lower). Each groove has 2 oil paths. Plug one of the oil paths for each groove with a piece of rubber before wrapping the cam journal with the tape.

Cover the 4 oil paths of the cam journal with tape as shown in the illustration.

Fig. Cover the 4 oil paths of the cam journal with tape

Puncture the tape covering the advance oil path and the retard oil path on the opposite side from the advance oil path.

Apply air at about 150 kPa (1.5 kgf*cm2) pressure into the 2 broken paths (the advance side path and the retard side path)

NOTE

Cover the paths with a shop rag or piece of cloth to prevent oil splashes.

Fig. Apply air pressure into the 2 broken paths

Confirm that the camshaft timing gear assembly revolves in the timing advance direction when the air pressure on the timing retard path is reduced.

NOTE

The lock pin is released, and the camshaft timing gear revolves in the advance direction.

When the camshaft timing gear reaches the most advanced position, release the air pressure on the timing retard side path, and then release the air pressure on the timing advance side path.

NOTE

The camshaft timing gear assembly occasionally shifts to the retard side abruptly, if the air pressure on the advance side path is released first. This often results in breakage of the lock pin.

Remove the flange bolt and remove the camshaft timing gear assembly.

NOTE

Do not remove the other 4 bolts. When reusing the camshaft timing gear, unlock the lock pin inside the camshaft timing gear first.

Fig. Exploded view of the camshaft assembly-1 of 2

Fig. Exploded view of the camshaft assembly-2 of 2

To install:

Install camshaft timing gear assembly:

Install the camshaft timing gear assembly onto the camshaft with the lock pin of the camshaft timing gear assembly released.

Put the camshaft timing gear assembly and camshaft together with the straight pin of the groove.

Turn the camshaft timing gear assembly clockwise while pushing it gently toward the camshaft. When the pin fits the groove, push to ensure a good fit.

NOTE

Do not turn the camshaft timing gear in the retard direction (clockwise).

Check that there is no clearance between the gear flange and the camshaft.

Do not lock the camshaft timing gear assembly when tightening the bolt. Release the lock pin of the camshaft timing gear assembly first, and tighten the bolt when the lock pin is locked in the most retarded position. Tightening the bolts with the lock pin locked could cause breakage of the lock pin.

Check that the camshaft timing gear assembly moves smoothly in the retard direction (clockwise) and is locked in the most retarded position.

Install camshaft:

Apply a light coat of engine oil to the camshaft and camshaft journals.

Install the chain onto the camshaft timing gear with the paint mark and the timing mark aligned.

NOTE

Tighten each bolt uniformly while keeping the camshaft level.

Fig. Install the chain onto the camshaft timing gear with the paint mark and the timing mark aligned

Examine the front marks and numbers on camshaft bearing cap No. 2 and check that the sequence is as shown in the illustration. Then uniformly tighten the bolts, in several steps, in the sequence shown in the illustration. Tighten to 9.4 ft. lbs. (13 Nm).

Fig. Camshaft bearing cap No. 2 installation sequence

Install no. 2 camshaft:

Install camshaft No. 2.

Hold the chain and align the timing mark on the camshaft timing sprocket with the paint mark of the chain.

Align the alignment pin hole in the camshaft timing sprocket with the alignment pin of the camshaft, and install the sprocket onto the camshaft.

Provisionally install the flange bolt.

Examine the front marks and numbers on camshaft bearing caps No. 1 and No. 2 and check that the sequence is as shown in the illustration. Then uniformly tighten the bolts, in several steps, in the sequence shown in the illustration.

NOTE

Tighten each bolt uniformly while keeping the camshaft level.

Bearing cap no.2: 9.4 ft. lbs. (13 Nm).

Bearing cap no. 1: 17 ft. lbs. (23 Nm).

Using a wrench, hold the hexagonal lobe of camshaft No. 2 and install the flange bolt. Tighten to 47 ft. lbs. (64 Nm).

Remove the bar from the timing chain tensioner.

Turn the crankshaft damper and align its timing notch with the timing mark "0" of the oil pump.

Check that all the pairs of timing marks are aligned.

Apply adhesive to the end 2 or 3 threads of the screw plug. Adhesive: Toyota Genuine Adhesive 1324, Three Bond 1324 or Equivalent